Synonyms for Mistaken:

adj.

all (adjective)
misguided.
dishonest (adjective)
untrue.
erroneous (adjective)
illogical, defective, miscalculated, Misconstrued, inexact, botched, marred, faulty, fallacious, misjudged, Misconceived, flawed, all wet, erroneous, misestimated, false, incorrect, inaccurate, distorted.
misguided (adjective)
Misled, unwarranted.
misinterpreted (adjective)
misread, garbled, misinterpreted, twisted, confused, misrepresented, misquoted, deformed, distorted, misunderstood.
wrong (adjective)
erroneous, faulty, fallacious, flawed, wrong, improper, inaccurate, untrue, false, bad, incorrect, illegal, aberrant, Misconstrued.
wrong, incorrect (adjective)
erroneous, Deceived, Misconstrued, false, faulty, unsound, all wet, confounded, Deluded, fallacious, confused, Misled, illogical, untrue, Fooled, inaccurate, unadvised, misguided.

n.

conceptual, inexact, confounded, metaphysical, Deceived, orthodox, popular, utopian, deterministic, central, theoretical, nonconformist, abstract, Deluded. ill-advised (noun)
unadvised, Deceived, Fooled, Misled, unwarranted.
mistaken (noun)
misguided, wrong, incorrect, false.

v.

confused (verb)
clouded, confused, Misconstrued, Mistook, flustered, perplexed, baffled, Obscured, muddled.
misinterpreted (verb)
deformed, misread, misquoted, confused, distorted, Mistook, misinterpreted, misunderstood, twisted, misrepresented, garbled.
misjudged (verb)
underestimated, overestimated.

Other synonyms:

d'oh, Deluded. Deceived. unsound. misguided
Misled, misguided.
mistaken
off.

Usage examples for mistaken

  1. " Oh, I think you are mistaken – Winding Paths by Gertrude Page
  2. But he may have been mistaken – The Untilled Field by George Moore
  3. You sure you're not mistaken – 100%: The Story of a Patriot by Upton Sinclair